Fix sorting of events

Events should be sorted reverse-chronologically, no matter what order
they come back from the API in, or which field in the API response
they’ve been extracted from.

app/main/views/history.py

@@ -1,4 +1,5 @@
 from collections import defaultdict
+from operator import attrgetter
 
 from flask import render_template, request
 
@@ -36,7 +37,7 @@ def _chunk_events_by_day(events):
 
     days = defaultdict(list)
 
-    for event in events:
+    for event in sorted(events, key=attrgetter('time'), reverse=True):
         days[format_date_numeric(event.time)].append(event)
 
     return sorted(days.items(), reverse=True)